Electricity: motive power systems – Motor-reversing – Periodic- or intermittent-reversing
Patent
1996-03-15
1998-11-03
Martin, David S.
Electricity: motive power systems
Motor-reversing
Periodic- or intermittent-reversing
318139, 318434, 173176, H02P 100
Patent
active
058314024
ABSTRACT:
A bi-directionally actuated hand tool provides a power assist during loose forward and loose backward (low torque) operation. The subject tool can be used in conventional mechanisms such as a sleeving spanner, gear wrench, mobile wrench, screwdriver, hoist, power puller, or crane, using only a light torque auxiliary motor drive, power cells, and relevant operation switches to provide a power assist for the purpose of speeding-up low torque operations while permitting manually application of high torques. The operation switches of the auxiliary drive may be synchronized with the switch that normally controls tool direction, and the value of the torque output by the auxiliary motor drive can be limited by either a mechanical or electrical torque detector to cut-off automatically whenever the torque is exceeded.
REFERENCES:
patent: Re31569 (1984-05-01), Eshghy
patent: 3596718 (1971-08-01), Fish et al.
patent: 4066133 (1978-01-01), Voss
patent: 4953053 (1990-08-01), Pratt
patent: 4967308 (1990-10-01), Morse
patent: 5361852 (1994-11-01), Inoue et al.
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